Return-Path: X-Spam-DCC: paranoid 1102; Body=2 Fuz1=2 Fuz2=2 X-Spam-Checker-Version: SpamAssassin 3.1.3 (2006-06-01) on lipkowski.org X-Spam-Level: X-Spam-Status: No, score=-2.5 required=5.0 tests=BAYES_00,FORGED_RCVD_HELO autolearn=unavailable version=3.1.3 Received: from post.thorcom.com (post.thorcom.com [195.171.43.25]) by paranoid.lipkowski.org (8.13.7/8.13.7) with ESMTP id t2KMH5NR024901 for ; Fri, 20 Mar 2015 23:17:09 +0100 Received: from majordom by post.thorcom.com with local (Exim 4.14) id 1YZ5AW-00016b-A7 for rs_out_1@blacksheep.org; Fri, 20 Mar 2015 22:13:28 +0000 Received: from [195.171.43.32] (helo=relay1.thorcom.net) by post.thorcom.com with esmtp (Exim 4.14) id 1YZ5AV-00016S-P6 for rsgb_lf_group@blacksheep.org; Fri, 20 Mar 2015 22:13:27 +0000 Received: from out65-ams.mf.surf.net ([145.0.1.65]) by relay1.thorcom.net with esmtps (TLSv1.2:DHE-RSA-AES256-GCM-SHA384:256) (Exim 4.85) (envelope-from ) id 1YZ5AT-0007VU-5u for rsgb_lf_group@blacksheep.org; Fri, 20 Mar 2015 22:13:26 +0000 Received: from smtps.utwente.nl (smtp-o1.utsp.utwente.nl [130.89.2.9]) by outgoing3-ams.mf.surf.net (8.14.4/8.14.4/Debian-4) with ESMTP id t2KMDNAC003079 for ; Fri, 20 Mar 2015 23:13:24 +0100 Received: from utwks06146.ad.utwente.nl (utwks06146.ad.utwente.nl [130.89.13.213]) by smtps.utwente.nl (8.13.8) with ESMTP id t2KMDNKD027995 for ; Fri, 20 Mar 2015 23:13:23 +0100 Received: by utwks06146.ad.utwente.nl (Postfix, from userid 17643373) id 7EBEC45C17EC; Fri, 20 Mar 2015 23:13:23 +0100 (CET) Date: Fri, 20 Mar 2015 23:13:23 +0100 From: Pieter-Tjerk de Boer To: rsgb_lf_group@blacksheep.org Message-ID: <20150320221323.GC4255@cs.utwente.nl> Mail-Followup-To: rsgb_lf_group@blacksheep.org MIME-Version: 1.0 Content-Disposition: inline User-Agent: Mutt/1.5.21 (2010-09-15) X-Bayes-Prob: 0.0001 (Score 0, tokens from: utwente-out:default, base:default, @@RPTN) X-CanIt-Geo: ip=130.89.2.9; country=NL; region=Provincie Overijssel; city=Enschede; latitude=52.2183; longitude=6.8958; http://maps.google.com/maps?q=52.2183,6.8958&z=6 X-CanItPRO-Stream: utwente-out:default (inherits from utwente:default,base:default) X-Canit-Stats-ID: 0bO5WdnQO - b434f131c855 - 20150320 (trained as not-spam) X-Scanned-By: MIMEDefang 2.56 on 10.1.3.10 X-Scanned-By: CanIt (www . roaringpenguin . com) X-Scan-Signature: 4ead635eadbaebfaa92cfec77deb715d Subject: LF: eclipse observations on Twente WebSDR Content-Type: text/plain; charset=us-ascii X-SA-Exim-Scanned: Yes Sender: owner-rsgb_lf_group@blacksheep.org Precedence: bulk Reply-To: rsgb_lf_group@blacksheep.org X-Listname: rsgb_lf_group X-SA-Exim-Rcpt-To: rs_out_1@blacksheep.org X-SA-Exim-Scanned: No; SAEximRunCond expanded to false Status: O X-Status: X-Keywords: X-UID: 2741 During the eclipse (and in fact already a few days in advance), I've been logging signal strengths over the entire 0 to 29 MHz spectrum using my WebSDR system in Enschede, The Netherlands. As was to be expected, the eclipse's effect was very clear on medium wave broadcast signals, and also on longwave, with, as Roelof already pointed out, Iceland's broadcast coming in very strongly. Surprisingly, on one broadcast station I saw a dip in propagation rather than enhancement, namely the 216 kHz longwave transmitter in southern France. Could that be due to destructive interference between skywave and groundwave? Preliminary results, including a wideband waterfall display, are now on http://wwwhome.cs.utwente.nl/~ptdeboer/ham/eclipse2015/ ; but more analysis still needs to be done. Regards, Pieter-Tjerk, PA3FWM